Date Picker not going away after selection

I was using a Date Picker (NOT an Input Calendar) in OutSystems 10 and noticed when I first load the page all seems fine. But then when I set the date and click away, the hidden date picker or as it is supposed to be.
Is not Hidden. It pops up at the bottom of the page.
The fix for this is as shown below in my answer. Just add the CSS to your Project if you having the same issue.

Solution
.pika-single.is-hidden{
    display: none;
}
Solution